[time-nuts] RS232 / GPS interface/prototyping board

[Mark Sims]

I have put my RS232 adapter board for GPS modules up on OSHPARK's shared projects page. 

https://oshpark.com/shared_projects/YPvKgMYa

It has connectors and holes for the Adafruit Ultimate GPS,  Trimble Resolution T timing receivers,  and generic (Vcc/Gnd/Tx/Rx) devices (like the popular Ublox NEO-6M based Crius CN06). The 1PPS signal is routed to the RS-232 connector via the MAX232A,  polarity is selectable.  There is a small prototyping area including an 8-pin DIP for a ATTINY CPU, etc.  GPS/MAX232A power can come from an on-board regulator or the DC IN jack.

Note:  use a MAX232A chip with 0.47uF caps, not the CP3232 marked on the silkscreen...  CP3232's are way too picky about their caps.